(Very) Hard AND nice puzzles
The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.
| Description | solved | Rating | |
|---|---|---|---|
 | Retraces by arbitrary (on 6. September 2024, 00:07) | 64 |  96 % |
| My Zipper is Broken by marty_sears (on 26. February 2024, 14:53) | 126 | 98 % |
| Islands by SamuPiano (on 7. December 2021, 04:52) | 50 | 98 % |
| Narwhal by Xenonetix (on 29. June 2022, 22:22) | 55 | 98 % |
| Differenz X Chaos Sudoku by tuace (on 17. December 2016, 11:03) | 45 | 96 % |
| Doubler RSL by Mad-Tyas (on 8. November 2024, 00:01) | 43 | 93 % |
| Cosmic Balance (FoW) by Nurator (on 20. January 2024, 20:16) | 200 | 96 % |
| LUSTIG - buntes Buchstabenrätsel / colorful letter puzzle by DocLogic (on 27. January 2021, 17:43) | 35 | 95 % |
| King's Guard by Fafrd (on 6. June 2022, 03:49) | 39 | 95 % |
| Profusion (Yin Yang Killer) by troptot (on 14. February 2023, 19:07) | 39 | 94 % |
| XOV to Cheyenne (0-9 Challenge) by The Bard (on 20. September 2025, 01:01) | 53 | 96 % |
| MasyU-Bahn (Teil 2) by Zzzyxas (on 2. April 2015, 20:35) | 66 | 99 % |
| Squishdomefel by Peter the Dog (on 9. December 2023, 10:22) | 80 | 92 % |
| LM 2018 Countdown: Roller Coaster (3) by Uhu (on 31. May 2018, 10:06) | 67 | 96 % |
| ▚▚ Summing-Zipper-Loop ▞▞ by ElChiglia (on 2. March 2024, 07:15) | 34 | 94 % |
| Patient Zeroes by gdc (on 26. October 2025, 15:38) | 230 | 97 % |
| Kropki Placement Sudoku #2 by udukos (on 24. November 2020, 10:27) | 26 | 92 % |
| Loads-N-Kayo by djorr (on 4. July 2022, 14:00) | 26 | 97 % |
| Negative Energy by Black_Doom (on 14. July 2024, 07:34) | 54 | 98 % |
| Convection Currents by ThePedallingPianist (on 20. May 2025, 15:16) | 29 | 91 % |
